Warren Controls 313 Overflow Trap traps steam and relieves condensate as developed in a deaerator’s overflow drain line. A Deaerator tank scrubs dissolved gasses out of the water, before entering a boiler as those gasses would otherwise be damaging. The DA tank ‘scrubs’ out these gasses via a steam blanket above the water line in the DA tank. The tank needs to regularly maintain its water capacity to supply the boiler and includes an automated fill valve. This is a critical function, as tank overflow can occur if the water entering the tank exceeds its capacity. The overflow trap performs its trapping and relieving functions through its internal pilot, and, it accomplishes this without the steam blanket escaping.